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Finding the Fourth Proportional to 7,913.80, 10,920.70 and 4,328.67

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Solution

The fourth proportional to 7,913.80, 10,920.70 and 4,328.67 is: 5,973.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,913.80 : 10,920.70 = 4,328.67 : x
  2. Step 2: Convert to fraction form
    7,913.80/10,920.70 = 4,328.67/x
  3. Step 3: Cross multiply
    7,913.80x = 10,920.70 × 4,328.67
  4. Step 4: Simplify right side
    7,913.80x = 47,272,106.47
  5. Step 5: Solve for x
    x = 47,272,106.47/7,913.80
  6. Step 6: Final answer
    x = 5,973.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.